Many of the cartridges based upon the original cartridge are not the result of the manufacturers. They were created by wildcatters and their ideas were later adapted and standardized by the manufacturers. A large number of our current cartridges can be traced back to two cartridges, the 30 06 & 375 H & H magnum. Even the 308, which has spawned a while family of cartridges, is essentially a shortened 30 06 case.
Yeah , whole lot started out some thing else .
Was just reading up on the 6.8spc it started out as a 30 Remington . I may sell my 5.56 and buy one ammo ain't to bad and it's gonna be a military round
May just pick up a upper